barrelfish vs stromateid fish

barrelfish and stromateid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
barrelfish	Yes	No	No	No
stromateid fish	Yes	No	No	No

As nouns, stromateid fish is a hypernym of barrelfish; that is, stromateid fish is a word with a broader meaning than barrelfish:

barrelfish: blackish fish of New England waters
stromateid fish: small marine fish with a short compressed body and feeble spines

Other hypernyms of barrelfish include butterfish, stromateid.

barrelfish (noun)	stromateid fish (noun)
blackish fish of New England waters	small marine fish with a short compressed body and feeble spines